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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4c5c9b68f56507d3afc0e862c6db90083fa5b3124cc1835f13ee23e1e9701fb3' 
  AND token = '4O6ZQASyhKSVKEbhVbhh1DjtUvSyDOPPo7jbgwfR5W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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