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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b26c34fa96a0ee06c8a58c51bbacd62e240e9b907b69a515a5a94f3332d439ef' 
  AND token = 'ZW4e5bmrn229HggdqRm13cT0+cx3rwYqSX2PN9Jc2z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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