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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '017e56f5beb1658bd4ad4e90fdc41a910cbc2d3bf60f387db68d86775349f6c0' 
  AND token = 'I61O8daixOCWLdzispmHl9cmzBys1Hv4k81xpsWoXk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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