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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0bcf90774b6ab1b9ce6a1325faf3fc23ecda1b1358a442e8243fbd46be8b86b9' 
  AND token = 'xQcrI/wcy6UR6FbUs6t78Q3l0ZDtCCthPWyt4QzaUOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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