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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '159587cfff6d50de70c8331c7309025cc9b0a1ce8f815bee1977332c3417eda4' 
  AND token = '8pSC4z3VNDi2wznFwZeKyOdxv08NL7hSBwET5Ha+faw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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