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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fcd3b6d690d17c9e13acfa484570a093a817eabf3fcf3b2adbbb69e0c21f096b' 
  AND token = 'Aq34Ut6C70mkjR1MW/TQ8oIxOYXrRBPpOl0BsB8t96Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}