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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '85bf6e8f0a90c30c7fb28e580d1c42f236dd247ecccd357dfda70e60635585de' 
  AND token = 'hCaex8olMBlYyfvIthOi4bT6FdAVGwJSHWTIQ1Id6L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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