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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3d6f29536ef4e7ccbcaa5145c7c94471e3703892220bd8827082d0779d3959ff' 
  AND token = 'IGh4Eu6ecHC2LYFGr4gcHitEHmpBPJXqOwemZ9bed8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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