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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '51ecc3829da65022eb63a8a08fdb2d214a53f0404c1d0b5d43626523683c342e' 
  AND token = 'P7BFqJtfSNcGhKW+31bEdUq2aCBcDmtnu7q4s7iAPa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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