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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a5b3cd62c13eb61f89c11b634329cc25a389ab5f6d68a4fd122d38b75e48637' 
  AND token = 'TiTqlvmvo/VHmpnsXHrNYTdr4WR4MbA0NbaS6hUvOPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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