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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '19d10292aef3fc3465fe64b18ade6c2eff0686defbadb6003d211dbd2e9ab43b' 
  AND token = 'M+wLy/hvihGh4ex1m9ugGAoqJqS9kzs53trSjH2gmxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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