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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ededc2bedbe4094f012da7ae7790a253e95ac76f43cdff43594e4444bad20842' 
  AND token = '51oauBwl7X+/GuJpMiO7dJfFemDtglWKgdFXJ40I3CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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