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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '666bc911882effc1c7266055bd110e2e82b0f8fe01e2b0a076061631bad6654e' 
  AND token = 'bJEym5cd5k1w+Dhz/9SpuosTF5duaLMw7wOTAqzwL0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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