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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9595d69c8aa06426b9dd63a9e2a5d5676b73c18992559c935a7ae840706b225d' 
  AND token = 'J6rvpBa136myl0+khw5jT0Xt0QC4jVXPoRGRRY+Hyp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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