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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd1b4653dc0f820058015042710d3f7e8bc4f0e7a52102c17ec2d362e8c61ccd5' 
  AND token = 'b7C3VeGWJUlERhMi9SDU1HjY/2CRoBbGUh6aZQGTrUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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