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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '530e52b7f8ab7c2d3eeb3d4c9efeca4edc667af0329f5f855ba12cf69cc556df' 
  AND token = '7J4cADoSXdTc2Qg1mz0DY+85JgMOD5oqbdVQM4ML8no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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